Hi, I have an older Hewlett Packard Pavilion laptop with Windows 98 and a Pentium II chip. (3 1/2 years old) I presently have 64 mb of RAM. I would like to upgrade it to 256 RAM. How many slots do I have? Which RAM chip do I buy? Do I take out the 64 and add one 256? Will I encounter problems if it's the wrong chip? Should I do it myself or bring it to Best Buy or Circuit City? Would like to use this laptop for trading when I am away. Basically, I am not technologically smart. I have no idea as to how to do this? Any suggestions? Thanks.